Settlement index precision for 15m binary crypto markets.
Retail traders lose on Kalshi 15m crypto contracts because they watch single venue Coinbase spot, cross a 7.00% taker spread, and exit before expiration. Strike15 reconstructs the four venue CF Benchmarks BRTI settlement index in real time, gates entries against Polymarket CLOB flow, and executes passive maker limits held to expiry.
Engineered for the exact Kalshi settlement specification.
Kalshi 15-minute crypto contracts do not settle on Coinbase last-trade ticks. They settle on the 60-second simple average of the CF Benchmarks Real-Time Index (BRTI) from minute 14:00 to 15:00. Every component of Strike15 v11 is built around this microstructure reality.
4-Exchange Synthetic CF Benchmarks BRTI Proxy
Queries L2 orderbooks and sub-minute trade streams simultaneously across Coinbase (40%), Kraken (30%), Bitstamp (15%), and Gemini (15%). Applies a 75/25 top-of-book and depth-impact blend, automatically penalizing any constituent venue that deviates >25 bps from the peer median during exchange outages or localized liquidity wicks.
BRTI(t) = Σ [ w_i · P_Penalty(dev_i) · Mid_Impact,i(t) ] / Σ w_i
S_settle = (1 / 60) · Σ_{t = T-59}^{T} BRTI(t)
60-Second Settlement Window Lock-In Engine
During the final 60 seconds of every 15-minute contract, each elapsed second permanently locks 1/60th of the final expiration value. By second 30, half of the settlement price is deterministic math—requiring double the remaining spot move to flip the outcome.
S_req(rem) = (60 · K − k_locked · Avg_locked) / (60 − k_locked)
Polymarket 15m CLOB Divergence Filter
Continuously compares Kalshi binary YES/NO quotes against Polymarket’s parallel 15-minute Up/Down CLOB orderbook. Suppresses entries when Polymarket flow diverges against Kalshi by >4¢, and flags high-conviction cross-venue lag opportunities.
Δ_PM = P_Polymarket(Up) − P_Kalshi(Yes) · Gate ≥ +4.0¢
Passive Maker Limit Execution (post_only)
Crossing the Kalshi spread as a market taker incurs a 7.00% variance fee Curve (0.07 · C · P · (1−P)) plus bid-ask slippage. Strike15 posts passive resting maker limits at bestBid + 1¢, reducing exchange fees to 1.75% and capturing spread edge.
Fee_Taker = $1.75 / 100 cts vs Fee_Maker = $0.44 / 100 cts
L2 Orderbook VWAP & Hold-to-Expiry Discipline
Walks the full Kalshi L2 synthetic ask ladder across $5 to $250 bet sizes before every signal. Replaces value-destroying early-exit panic sells (which pay double taker fees + wide mid-window spreads) with calibrated hold-to-expiry binary resolution.
EV_net = p_calibrated · $1.00 − (VWAP_fill + Fee_Maker) > +3.5¢
Strategy & Fee Economics Explorer (2,000-Market Audit)
Toggle between the standard retail workflow and the Strike15 v11 quantitative execution engine across 2,000 historical 15-minute Kalshi windows to inspect where edge is lost and recovered.
| Microstructure Dimension | Active Configuration | Per-Trade Impact | 100-Trade Cumulative |
|---|
Real-time 4-Exchange BRTI settlement telemetry and Kalshi L2 orderbook inspection.
- Live 4-Exchange CF Benchmarks BRTI vs Coinbase Basis Monitor
- Live Kalshi 15m L2 Orderbook & VWAP Slippage Viewer
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Interactive Simulation, Backtest & Calibration Lab (
/lab) - BTC 15m Primary Feed + Paper Trading Ledger
Full 5-asset BRTI signal engine, Polymarket CLOB divergence gate, and Minute-14 lock-in alerts.
- Real-time Min 3/5 Sigma + 4-Exchange Confirmation Signals
- Polymarket >4¢ Cross-Venue CLOB Arbitrage Alerts
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Minute 14 Settlement Lock-In Probability (
p_lock) Engine - Multi-Asset 15m Scanner (BTC, ETH, SOL, XRP, DOGE)
- Low-Latency Audio & Browser Execution Alerts
Direct RSA-PSS signed Kalshi v2 API order routing, post_only Maker execution (1.75% fee tier), and two-way Kalshi app sync.
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Automated Kalshi v2 API Order Execution (
post_onlyMaker Limit + Tight Taker) - Fee-Inclusive Kelly & Volatility Contract Sizing Governor
- Autonomous Paper-Lock & Loss-Streak Circuit Breakers
- 15-Second Two-Way Kalshi App Portfolio & Fill Sync + CSV/JSON Export
Turnkey trader retention, BRTI settlement telemetry, and maker liquidity engine for CFTC DCMs & desks.
- White-Label Retention & Decision Engine for CFTC Exchanges
- Dedicated 4-Venue Synthetic BRTI Tick & Settlement Feed
- Full Source Code, 2,000-Market Audit & IP Acquisition Room
- Custom FIX / WebSocket Integration & Engineering SLA
Direct access to every quantitative module.
Strike15 ships as an integrated suite of four production applications: live multi-asset execution terminal, interactive decision walkthrough, empirical calibration lab, and state-space logger.
Live Trading Terminal
Multi-asset (BTC, ETH, SOL, XRP, DOGE) 15-minute execution workstation with live 4-exchange BRTI, 60s lock-in physics, and Kalshi v2 API order routing.
Interactive Decision Walkthrough
Step through the 15-minute read-point timeline (Min 3, Min 5, Min 8, Min 14 Lock-In) and inspect autonomous bankroll sizing rules.
Quant Calibration Lab
Inspect Brier scores, quote-implied vs realized probability curves, maker vs taker fee attribution, and regime filters.
State-Space & Quote Logger
High-frequency state vector recorder for Kalshi L2 depth, Polymarket CLOB spreads, and 4-exchange BRTI basis history.